Signal Processing: New Applicationshttp://www.maplesoft.com/applications/category.aspx?cid=2880
en-us2017 Maplesoft, A Division of Waterloo Maple Inc.Maplesoft Document SystemFri, 18 Aug 2017 05:03:56 GMTFri, 18 Aug 2017 05:03:56 GMTNew applications in the Signal Processing categoryhttp://www.mapleprimes.com/images/mapleapps.gifSignal Processing: New Applicationshttp://www.maplesoft.com/applications/category.aspx?cid=2880
Interaural Time Delayhttps://www.maplesoft.com/applications/view.aspx?SID=154010&ref=Feed
Humans locate the origin of a sound with several cues. One technique employs the small difference in the time taken for the sound to reach either ear; this is known as the interaural time delay (ITD).
<BR><BR>
This application modifies a single-channel audio file so that the sound appears to originate at an angle from the observer. It does this by introducing an extra channel of sound. The new channel is equivalent to the old channel, but is padded with zeroes. <BR><BR>
Despite both channels having the same amplitude, the sound appears to come from an angle simply by delaying one channel.<img src="/view.aspx?si=154010/time_delay.png" alt="Interaural Time Delay" align="left"/>Humans locate the origin of a sound with several cues. One technique employs the small difference in the time taken for the sound to reach either ear; this is known as the interaural time delay (ITD).
<BR><BR>
This application modifies a single-channel audio file so that the sound appears to originate at an angle from the observer. It does this by introducing an extra channel of sound. The new channel is equivalent to the old channel, but is padded with zeroes. <BR><BR>
Despite both channels having the same amplitude, the sound appears to come from an angle simply by delaying one channel.154010Wed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanSpectogramshttps://www.maplesoft.com/applications/view.aspx?SID=154012&ref=Feed
A spectrogram illustrates how the constituent frequencies of a signal vary over time. This application generates the spectrogram of several audio files, including a
<UL>
<LI> DTMS tone,
<LI> human voice saying “MapleSim”,
<LI> violin note played with vibrato, and an entire violin scale,
<LI> C8 piano note,
<LI> series of dolphin clicks,
<LI> and more.
</UL>
Interestingly, some electronic musicians hide images in their music; you can only view these images with a spectrogram of the appropriate part of the audio. This includes the track “My Violent Heart” by Nine Inch Nails; you can view this spectrogram in this application.<img src="/view.aspx?si=154012/Spectrograms.png" alt="Spectograms" align="left"/>A spectrogram illustrates how the constituent frequencies of a signal vary over time. This application generates the spectrogram of several audio files, including a
<UL>
<LI> DTMS tone,
<LI> human voice saying “MapleSim”,
<LI> violin note played with vibrato, and an entire violin scale,
<LI> C8 piano note,
<LI> series of dolphin clicks,
<LI> and more.
</UL>
Interestingly, some electronic musicians hide images in their music; you can only view these images with a spectrogram of the appropriate part of the audio. This includes the track “My Violent Heart” by Nine Inch Nails; you can view this spectrogram in this application.154012Wed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanFiltering Frequency Domain Noisehttps://www.maplesoft.com/applications/view.aspx?SID=154009&ref=Feed
This application filters noise from the frequency domain representation of an experimental data set.<img src="/view.aspx?si=154009/thumb.png" alt="Filtering Frequency Domain Noise" align="left"/>This application filters noise from the frequency domain representation of an experimental data set.154009Wed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanSunspot Periodicityhttps://www.maplesoft.com/applications/view.aspx?SID=154013&ref=Feed
This application will find the periodicity of sunspots with two separate approaches:
<UL>
<LI>frequency domain transformation of the data
<LI>autocorrelation
</UL>
Both approaches should yield the same result.
<BR><BR>
Yearly sunspot data since 1700 is downloaded from a web-based source provided by the Royal Observatory of Belgium<img src="/view.aspx?si=154013/sunspotPeriodicityThumb.png" alt="Sunspot Periodicity" align="left"/>This application will find the periodicity of sunspots with two separate approaches:
<UL>
<LI>frequency domain transformation of the data
<LI>autocorrelation
</UL>
Both approaches should yield the same result.
<BR><BR>
Yearly sunspot data since 1700 is downloaded from a web-based source provided by the Royal Observatory of Belgium154013Wed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanAudio Filtering and Spectrogram Generatorhttps://www.maplesoft.com/applications/view.aspx?SID=154008&ref=Feed
This applications lets you apply a filter to an audio file, and then generate the spectrogram and power spectrum<img src="/view.aspx?si=154008/audio_filtering.png" alt="Audio Filtering and Spectrogram Generator" align="left"/>This applications lets you apply a filter to an audio file, and then generate the spectrogram and power spectrum154008Wed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanInteraural Time Delayhttps://www.maplesoft.com/applications/view.aspx?SID=153780&ref=Feed
<p>Humans locate the origin of a sound with several cues. One technique employs the small difference in the time taken for the sound to reach either ear; this is known as the interaural time delay (ITD). This application modifies a single-channel audio file so that the sound appears to originate at an angle from the observer. It does this by introducing an extra channel of sound. Despite both channels having the same amplitude, the sound appears to come from an angle simply by delaying one channel.</p><img src="/view.aspx?si=153780/interaural.png" alt="Interaural Time Delay" align="left"/><p>Humans locate the origin of a sound with several cues. One technique employs the small difference in the time taken for the sound to reach either ear; this is known as the interaural time delay (ITD). This application modifies a single-channel audio file so that the sound appears to originate at an angle from the observer. It does this by introducing an extra channel of sound. Despite both channels having the same amplitude, the sound appears to come from an angle simply by delaying one channel.</p>153780Tue, 31 Mar 2015 04:00:00 ZSamir KhanSamir KhanSpectogram Exampleshttps://www.maplesoft.com/applications/view.aspx?SID=153571&ref=Feed
<p>A spectrogram illustrates how the constituent frequencies of a signal vary over time. This application generates the spectrogram of several audio files, including a</p>
<ul>
<li>DTMS tone,</li>
<li>human voice saying &ldquo;MapleSim&rdquo;, </li>
<li>violin note played with vibrato, and an entire violin scale,</li>
<li>C8 piano note,</li>
<li>series of dolphin clicks,</li>
<li>and more.</li>
</ul>
<p>Interestingly, some electronic musicians hide images in their music; you can only view these images with a spectrogram of the appropriate part of the audio. This includes the track &ldquo;My Violent Heart&rdquo; by the Nine Inch Nails; you can view this spectrogram in this application.</p>
<p>The Spectrogram() function was introduced in Maple 18, and also lets you plot the waveform and power spectrum. You can also control the precise color grading, and range of colors used to represent the strength of the frequency contents.</p><img src="/view.aspx?si=153571/spectograms.png" alt="Spectogram Examples" align="left"/><p>A spectrogram illustrates how the constituent frequencies of a signal vary over time. This application generates the spectrogram of several audio files, including a</p>
<ul>
<li>DTMS tone,</li>
<li>human voice saying &ldquo;MapleSim&rdquo;, </li>
<li>violin note played with vibrato, and an entire violin scale,</li>
<li>C8 piano note,</li>
<li>series of dolphin clicks,</li>
<li>and more.</li>
</ul>
<p>Interestingly, some electronic musicians hide images in their music; you can only view these images with a spectrogram of the appropriate part of the audio. This includes the track &ldquo;My Violent Heart&rdquo; by the Nine Inch Nails; you can view this spectrogram in this application.</p>
<p>The Spectrogram() function was introduced in Maple 18, and also lets you plot the waveform and power spectrum. You can also control the precise color grading, and range of colors used to represent the strength of the frequency contents.</p>153571Wed, 07 May 2014 04:00:00 ZSamir KhanSamir KhanAutomatic Speech Segmentationhttps://www.maplesoft.com/applications/view.aspx?SID=153553&ref=Feed
<p>This worksheet demonstrates the use of the Forward-Backward Divergence model (FBD) in Automatic Speech Segmentation, and how it detects discontinuities in the voice signal. It illustrates in the example below how it is possible to enlarge some segments of the speech (vowels enlargement for instance). To realize this result, it is possible to visually and acoustically perceive the stationary segments of the speech signal.</p><img src="/view.aspx?si=153553/speech.png" alt="Automatic Speech Segmentation" align="left"/><p>This worksheet demonstrates the use of the Forward-Backward Divergence model (FBD) in Automatic Speech Segmentation, and how it detects discontinuities in the voice signal. It illustrates in the example below how it is possible to enlarge some segments of the speech (vowels enlargement for instance). To realize this result, it is possible to visually and acoustically perceive the stationary segments of the speech signal.</p>153553Thu, 17 Apr 2014 04:00:00 ZJocelyn MagneJocelyn MagneWavelet analysis of the blood pressure and pulse frequency measurements with Maplehttps://www.maplesoft.com/applications/view.aspx?SID=149420&ref=Feed
<p>A significant part of medical signals, or observations, is non-stationary, discrete time sequences. Thus, the computer methods analysis, as well as refinement and compression, are very helpful as for the problems of recognition and detection of their key diagnostic features. We are going to illustrate here this statement with examples of very common, and even routine medical measurements of blood pressure as well as pulse rate and with possibilities of Maple.<br />The package of Discrete Wavelet transforms (DWT) within Maple 16 [1] was recently added as new research software just for such tasks. The practical testing of this package was additional goal of present study.</p><img src="/view.aspx?si=149420/4b9024ee653d2c7be8febb717b1df52a.gif" alt="Wavelet analysis of the blood pressure and pulse frequency measurements with Maple" align="left"/><p>A significant part of medical signals, or observations, is non-stationary, discrete time sequences. Thus, the computer methods analysis, as well as refinement and compression, are very helpful as for the problems of recognition and detection of their key diagnostic features. We are going to illustrate here this statement with examples of very common, and even routine medical measurements of blood pressure as well as pulse rate and with possibilities of Maple.<br />The package of Discrete Wavelet transforms (DWT) within Maple 16 [1] was recently added as new research software just for such tasks. The practical testing of this package was additional goal of present study.</p>149420Sun, 14 Jul 2013 04:00:00 ZIrina A. DanishewskaIrina A. DanishewskaFiltering Frequency Domain Noisehttps://www.maplesoft.com/applications/view.aspx?SID=144593&ref=Feed
<p>This application demonstrates how you can filter low-power noise from the frequency domain representation of experimental data.</p><img src="/view.aspx?si=144593/10748a72d8047dfc094a9cdc7e3de5cd.gif" alt="Filtering Frequency Domain Noise" align="left"/><p>This application demonstrates how you can filter low-power noise from the frequency domain representation of experimental data.</p>144593Wed, 13 Mar 2013 04:00:00 ZMaplesoftMaplesoftPeriodicity of Sunspotshttps://www.maplesoft.com/applications/view.aspx?SID=144592&ref=Feed
<p>This application finds the periodicity of sunspots with two independent approaches</p>
<ul>
<li>a frequency domain transformation of the data, </li>
<li>and autocorrelation. </li>
</ul>
<p>If implemented and interpreted correctly, both approaches should give the same sunspot period. The application uses routines from Maple 17&rsquo;s new <a href="/products/maple/new_features/signal_processing.aspx">Signal Processing package</a>, and uses historical sunspot data from the National Geophysical Data Center. Additionally, an embedded video component demonstrates how you can zoom into a plot.</p><img src="/view.aspx?si=144592/sunspots.jpg" alt="Periodicity of Sunspots" align="left"/><p>This application finds the periodicity of sunspots with two independent approaches</p>
<ul>
<li>a frequency domain transformation of the data, </li>
<li>and autocorrelation. </li>
</ul>
<p>If implemented and interpreted correctly, both approaches should give the same sunspot period. The application uses routines from Maple 17&rsquo;s new <a href="/products/maple/new_features/signal_processing.aspx">Signal Processing package</a>, and uses historical sunspot data from the National Geophysical Data Center. Additionally, an embedded video component demonstrates how you can zoom into a plot.</p>144592Wed, 13 Mar 2013 04:00:00 ZMaplesoftMaplesoftSpectogram Generatorhttps://www.maplesoft.com/applications/view.aspx?SID=144590&ref=Feed
<p>This application lets you load wave files, apply windows and IIR/FIR filters, and view the spectrogram, power spectrum and waveform. You can also set filter cut-off frequencies by clicking on the power spectrum plot.</p><img src="/view.aspx?si=144590/spectogram_thumb.png" alt="Spectogram Generator" align="left"/><p>This application lets you load wave files, apply windows and IIR/FIR filters, and view the spectrogram, power spectrum and waveform. You can also set filter cut-off frequencies by clicking on the power spectrum plot.</p>144590Wed, 13 Mar 2013 04:00:00 ZSamir KhanSamir KhanPricing European Call Options with FFTshttps://www.maplesoft.com/applications/view.aspx?SID=144589&ref=Feed
<p>This application compares the price of a European call option with FFTs (using the approach outlined by Carr &amp; Madan in <em>Option Pricing Using the Fast Fourier Transform</em>) and the analytical approach. The application uses the efficient FFT function offered by Maple 17&rsquo;s new <a href="/products/maple/new_features/signal_processing.aspx">Signal Processing tools</a>.</p><img src="/applications/images/app_image_blank_lg.jpg" alt="Pricing European Call Options with FFTs" align="left"/><p>This application compares the price of a European call option with FFTs (using the approach outlined by Carr &amp; Madan in <em>Option Pricing Using the Fast Fourier Transform</em>) and the analytical approach. The application uses the efficient FFT function offered by Maple 17&rsquo;s new <a href="/products/maple/new_features/signal_processing.aspx">Signal Processing tools</a>.</p>144589Wed, 13 Mar 2013 04:00:00 ZSamir KhanSamir Khan